Question 1

Which of the following designations indicates a sex-linked trait? A)A B)I^A C)X^B D)a E)i

Accepted Answer

A sex-linked trait is shown as the letter attached to the X chromosome.A and a are alleles for autosomal traits.I^A and i are the alleles for blood types.

Question 2

If two parents who are unaffected have a child that is affected,then the parents are both considered bearers.

Accepted Answer

Two parents who are unaffected but are heterozygous for a recessive disorder are considered carriers.

Question 3

Which of the following X-linked recessive disorders is characterized by a degeneration of the muscles?
A)Fragile X
B)Duchenne's
C)color blindness
D)hemophilia
E)malaria

Accepted Answer

Duchenne's muscular dystrophy is characterized by a degeneration of the muscles.Fragile X is characterized by mental impairment.Color blindness is the inability to distinguish between various colors,typically red and green.Hemophilia is the inability for the blood to clot normally.Malaria is caused by a protist and is not an X linked disorder.

Question 4

Which of the following terms refers to the genes of an individual?
A)genotype
B)phenotype
C)gamete
D)probability
E)autosomal

Accepted Answer

The genetic make-up of an individual is called the genotype.

Question 5

Which of the following genotypes is heterozygous?
A)Aa
B)Ab
C)aB
D)ab
E)aa

Accepted Answer

A heterozygous genotype is indicated by two of the same letters,one capital and one lower case.

Question 6

Which of the following is a dominant allele?
A)A
B)a
C)AA
D)ab
E)Ab

Accepted Answer

An allele is represented by a single,capitalized letter.

Question 7

Which of the following disorders is a trinucleotide repeat disorder?
A)Marfan syndrome
B)sickle-cell disease
C)cystic fibrosis
D)Tay-Sachs disease
E)Huntington disease

Accepted Answer

Huntington disease is caused by the base sequence CAG repeated over and over again in the protein huntingtin.

Question 8

It is estimated that there are fewer than 100 genetic diseases caused by single gene mutations in humans.

Accepted Answer

It is estimated that there are over 4000 identified genetic disorders caused by single gene mutations in humans.

Question 9

Which of the following disorders is caused by a defect in the production of an elastic connective tissue protein called fibrillin?
A)cystic fibrosis
B)Tay-Sachs disease
C)Marfan syndrome
D)Huntington disease
E)sickle-cell disease

Accepted Answer

Marfan syndrome is caused by a defect in the production of an elastic connective tissue protein called fibrillin.

Question 10

Which of the following represents a dihybrid cross?
A)ff x ff
B)Gg x gg
C)AAbb x Aabb
D)AAbb x aaBB
E)Ss x ss

Accepted Answer

A dihybrid cross involves two different sets of alleles that are not identical to each other.

Question 11

How is familial hypercholesterolemia inherited?
A)autosomal recessive
B)autosomal dominant
C)incompletely dominant
D)codominant
E)sex-linked dominant

Accepted Answer

Familial hypercholesterolemia is an incompletely dominant disorder.

Question 12

Which of the following is not an autosomal recessive disorder?
A)Marfan syndrome
B)Tay-Sachs disease
C)cystic fibrosis
D)sickle cell disease
E)all are autosomal recessive disorders

Accepted Answer

Marfan syndrome is inherited as an autosomal dominant disorder.

Question 13

Which of the following would not be a possible way to list someone's genotype?
A)BB
B)Bb
C)AB
D)bb
E)AA

Accepted Answer

A genotype usually involves 2 of the same letters--either both capitalized,both lower case,or one of each.

Question 14

When describing someone as "lactose intolerant",you are describing their
A)genotype.
B)phenotype.
C)alleles.
D)genome.
E)none of these

Accepted Answer

Lactose intolerant is a description of the physical characteristic of the individual,therefore,it is a phenotype.The genotype is the genetic makeup of the individual.The alleles and genome are the genetic material contained in the nucleus of the individual.

Question 15

Which of the following traits is an X-linked recessive disorder?
A)Color blindness
B)Tay-Sachs
C)Cystic fibrosis
D)Sickle-cell disease
E)Marfan syndrome

Accepted Answer

Color blindness is a X-linked recessive disorder.Tay-Sachs,cystic fibrosis,and sickle-cell disease are autosomal dominant disorders.Marfan syndrome is an autosomal recessive disorder.

Question 16

Which of the following is an example of a recessive genotype?
A)aa
B)Aa
C)short
D)AA
E)ab

Accepted Answer

Recessive genotypes are designated with two lower case letters.Dominant genotypes are designated with two upper case letters or one upper case and one lower case letter.Short is a phenotypic description.

Question 17

A male inherits his X linked allele from his mother.

Accepted Answer

A man will inherit his X allele from his mother and his Y allele from his father.

Question 18

What is the genotype of a person with type O blood? A)I^AI^A B)I^AI^B C)I^Ai D)I^Bi E)ii

Accepted Answer

The person's genotype will be ii.

Question 19

The square that is used to make all the possible combinations of gametes is called a Punnett square.

Accepted Answer

Reginald Punnett introduced the Punnett square in his genetic classes in 1909.

Question 20

When you describe a person as having attached ear lobes,you are describing their genotype.

Accepted Answer

You are describing their phenotype,or the physical appearance of the trait.

Quiz 21: Patterns of Genetic Inheritance

Which of the following designations indicates a sex-linked trait?

If two parents who are unaffected have a child that is affected,then the parents are both considered bearers.

Which of the following X-linked recessive disorders is characterized by a degeneration of the muscles?

Which of the following terms refers to the genes of an individual?

Which of the following genotypes is heterozygous?

Which of the following is a dominant allele?

Which of the following disorders is a trinucleotide repeat disorder?

It is estimated that there are fewer than 100 genetic diseases caused by single gene mutations in humans.

Which of the following disorders is caused by a defect in the production of an elastic connective tissue protein called fibrillin?

Which of the following represents a dihybrid cross?

How is familial hypercholesterolemia inherited?

Which of the following is not an autosomal recessive disorder?

Which of the following would not be a possible way to list someone's genotype?

When describing someone as "lactose intolerant",you are describing their

Which of the following traits is an X-linked recessive disorder?

Which of the following is an example of a recessive genotype?

A male inherits his X linked allele from his mother.

What is the genotype of a person with type O blood?

The square that is used to make all the possible combinations of gametes is called a Punnett square.

When you describe a person as having attached ear lobes,you are describing their genotype.